A flag is seen at half-staff outside a home honoring NYPD Detective Joseph Lemm down the street from...
A flag is seen at half-staff outside a home honoring NYPD Detective Joseph Lemm down the street from the 50th precinct in the Bronx borough of New York December 22, 2015. Six American troops, including Lemm, a 15-year veteran of the NYPD who also volunteered in the U.S. Air National Guard and was on his third deployment to war zones, were killed Monday when a suicide bomber on a motorbike struck their patrol in the deadliest attack on U.S. forces this year. REUTERS/Shannon Stapleton